Spell Betrayal

Type of Feat: Class
Prerequisite: Thrall of Graz'zt
When Casting a damage-dealing spell at a target or targets denied their dexterity bonus, a Thrall of Graz'zt can increase the damage dealt. At second level, she adds +1d6 damage to a spell cast against flat-footed targets.

This damage increases +1d6 every other level starting at level 2 (2, 4, 6, 8, 10) for a max of +15d6 at level 30.